This treatise began as a lecture given by Andrew Alföldi at the International Congress of the Numismatists, London, 1936. It was published in 1937 as part of the Dissertationes Pannonicae ; ser. II, fasc. 7 under the titles: Isis-szertartások Rómában a negyedik század keresztény császárai alatt. = A festival of Isis in Rome under the Christian emperors of the IVth century ... by Andrew Alföldi.